1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * NHPoly1305 - ε-almost-∆-universal hash function for Adiantum 4 * (NEON accelerated version) 5 * 6 * Copyright 2018 Google LLC 7 */ 8 9 #include <asm/neon.h> 10 #include <asm/simd.h> 11 #include <crypto/internal/hash.h> 12 #include <crypto/internal/simd.h> 13 #include <crypto/nhpoly1305.h> 14 #include <linux/module.h> 15 16 asmlinkage void nh_neon(const u32 *key, const u8 *message, size_t message_len, 17 u8 hash[NH_HASH_BYTES]); 18 19 /* wrapper to avoid indirect call to assembly, which doesn't work with CFI */ 20 static void _nh_neon(const u32 *key, const u8 *message, size_t message_len, 21 __le64 hash[NH_NUM_PASSES]) 22 { 23 nh_neon(key, message, message_len, (u8 *)hash); 24 } 25 26 static int nhpoly1305_neon_update(struct shash_desc *desc, 27 const u8 *src, unsigned int srclen) 28 { 29 if (srclen < 64 || !crypto_simd_usable()) 30 return crypto_nhpoly1305_update(desc, src, srclen); 31 32 do { 33 unsigned int n = min_t(unsigned int, srclen, SZ_4K); 34 35 kernel_neon_begin(); 36 crypto_nhpoly1305_update_helper(desc, src, n, _nh_neon); 37 kernel_neon_end(); 38 src += n; 39 srclen -= n; 40 } while (srclen); 41 return 0; 42 } 43 44 static struct shash_alg nhpoly1305_alg = { 45 .base.cra_name = "nhpoly1305", 46 .base.cra_driver_name = "nhpoly1305-neon", 47 .base.cra_priority = 200, 48 .base.cra_ctxsize = sizeof(struct nhpoly1305_key), 49 .base.cra_module = THIS_MODULE, 50 .digestsize = POLY1305_DIGEST_SIZE, 51 .init = crypto_nhpoly1305_init, 52 .update = nhpoly1305_neon_update, 53 .final = crypto_nhpoly1305_final, 54 .setkey = crypto_nhpoly1305_setkey, 55 .descsize = sizeof(struct nhpoly1305_state), 56 }; 57 58 static int __init nhpoly1305_mod_init(void) 59 { 60 if (!(elf_hwcap & HWCAP_NEON)) 61 return -ENODEV; 62 63 return crypto_register_shash(&nhpoly1305_alg); 64 } 65 66 static void __exit nhpoly1305_mod_exit(void) 67 { 68 crypto_unregister_shash(&nhpoly1305_alg); 69 } 70 71 module_init(nhpoly1305_mod_init); 72 module_exit(nhpoly1305_mod_exit); 73 74 MODULE_DESCRIPTION("NHPoly1305 ε-almost-∆-universal hash function (NEON-accelerated)"); 75 MODULE_LICENSE("GPL v2"); 76 MODULE_AUTHOR("Eric Biggers <ebiggers@google.com>"); 77 MODULE_ALIAS_CRYPTO("nhpoly1305"); 78 MODULE_ALIAS_CRYPTO("nhpoly1305-neon"); 79